Author: neel
Date: Tue Aug 27 16:49:20 2013
New Revision: 254964
URL: http://svnweb.freebsd.org/changeset/base/254964
Log:
Add support for emulating the byte move instruction "mov r/m8, r8".
This emulation is required when dumping MMIO space via the ddb "examine"
command.
Modified:
head/sys/amd64/vmm/vmm_instruction_emul.c
Modified: head/sys/amd64/vmm/vmm_instruction_emul.c
==============================================================================
--- head/sys/amd64/vmm/vmm_instruction_emul.c Tue Aug 27 16:45:00 2013
(r254963)
+++ head/sys/amd64/vmm/vmm_instruction_emul.c Tue Aug 27 16:49:20 2013
(r254964)
@@ -77,6 +77,10 @@ static const struct vie_op one_byte_opco
.op_byte = 0x89,
.op_type = VIE_OP_TYPE_MOV,
},
+ [0x8A] = {
+ .op_byte = 0x8A,
+ .op_type = VIE_OP_TYPE_MOV,
+ },
[0x8B] = {
.op_byte = 0x8B,
.op_type = VIE_OP_TYPE_MOV,
@@ -268,13 +272,18 @@ emulate_mov(void *vm, int vcpuid, uint64
error = memwrite(vm, vcpuid, gpa, val, size, arg);
}
break;
+ case 0x8A:
case 0x8B:
/*
* MOV from mem (ModRM:r/m) to reg (ModRM:reg)
+ * 8A/r: mov r/m8, r8
+ * REX + 8A/r: mov r/m8, r8
* 8B/r: mov r32, r/m32
* REX.W 8B/r: mov r64, r/m64
*/
- if (vie->rex_w)
+ if (vie->op.op_byte == 0x8A)
+ size = 1;
+ else if (vie->rex_w)
size = 8;
error = memread(vm, vcpuid, gpa, &val, size, arg);
if (error == 0) {
@@ -688,7 +697,6 @@ decode_modrm(struct vie *vie)
vie->base_register = VM_REG_GUEST_RIP;
else
vie->base_register = VM_REG_LAST;
-
}
break;
}
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